Overview
The TPS61251DSGR is a high-efficiency boost converter designed by Texas Instruments. This device is ideal for battery backup charging applications and supports a wide range of input voltages, making it suitable for portable electronics such as mobile phones, solid-state drives (SSD), and wireless modems. The converter operates as a quasi-constant frequency adaptive on-time controller with a typical operating frequency of 3.5 MHz. It features adjustable output voltage up to 6.5 V and an adjustable input current limit with ±10% accuracy. The device also includes a snooze mode that reduces quiescent current to 2 μA, enhancing power efficiency during light loads.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VIN Range | 2.3 | - | 6 | V |
| VOUT Range | - | - | 6.5 | V |
| Input Current Limit | 100 mA | - | 1500 mA | A |
| Efficiency | - | Up to 92% | - | % |
| Operating Frequency | - | 3.5 MHz | - | Hz |
| Quiescent Current (Snooze Mode) | - | 2 μA | - | A |
| Package Type | - | - | WSON-8 (2x2 mm) | - |
| Operating Junction Temperature | -40 | - | 125 | °C |
Key Features
- Adjustable output voltage up to 6.5 V
- Programmable input current limit from 100 mA to 1500 mA with ±10% accuracy
- Snooze mode with 2 μA typical quiescent current
- Up to 92% efficiency
- 100% duty-cycle mode when VIN > VOUT
- Load disconnect and reverse current protection
- Short-circuit protection
- Overtemperature protection with 140°C threshold and 20°C hysteresis
- Internal softstart and loop compensation
- Power good output indicates appropriate output voltage level even in shutdown
Applications
- Current limited applications with high peak power loads (e.g., SSD, PCMCIA Tx bursts, memory, GPRS/GSM Tx)
- Lithium-ion battery applications
- Battery backup applications
- Audio applications
- RF power amplifier (RF-PA) buffer applications
Q & A
- What is the typical operating frequency of the TPS61251DSGR?
The typical operating frequency is 3.5 MHz.
- What is the range of the adjustable input current limit?
The input current limit can be programmed from 100 mA to 1500 mA.
- What is the efficiency of the TPS61251DSGR?
The efficiency can be up to 92%.
- What is the quiescent current in snooze mode?
The quiescent current in snooze mode is typically 2 μA.
- What type of package does the TPS61251DSGR come in?
The device is available in a WSON-8 package measuring 2x2 mm.
- What are the key protection features of the TPS61251DSGR?
The device includes load disconnect, reverse current protection, short-circuit protection, and overtemperature protection.
- How does the TPS61251DSGR handle high current pulses?
The device, in combination with a reservoir capacitor, can provide high current pulses without exceeding the capability of the supplying circuit.
- What is the purpose of the power good output?
The power good output indicates whether the output voltage is within the appropriate level, even during shutdown.
- How does the device manage thermal issues during charging large capacitors?
The device limits the current to a lower value when the temperature is high to prevent overheating during the charge phase.
- What are some common applications for the TPS61251DSGR?
Common applications include current limited applications, lithium-ion battery applications, battery backup, audio, and RF-PA buffer applications.
